Changes in Acto for running tests on kubeblocks postgresql operator

[raunaks13]

Mainly 3 changes -

1. Added scope for running kubectl create -f file along with apply and wait commands.
2. Removed server-side flag while running kubectl apply since that prevented kubeblocks addon extensions from being deployed successfully
3. Added a folder with some useful data for the kubeblocks postgresql operator (similar to other operators present in the data folder)

[tianyin]

@raunaks13 Thanks for the PR!

Could you break the PR into two or even three? Each PR should focus on a small thing and only one thing at a time.

#3 is apparently different from #1 and #2.

I'm not sure if #1 and #2 are correlated or not.

[ziyue-pan]

I met with the same issues caused by server-side flags. But there are cases in which a server-side flag is necessary.

Regarding 2, I have an idea of adding an option "server-side": true/false (default to true) to control the flag manually.